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I feel that I am making some small progress. I have reset the pump to Constant mode and setting 2, the display is showing 30 Watts at 3 meter head. With this setting I am now getting a 12 degree differential. I have also opened up all of the radiator regulator valves. I am reluctant to...

I used the Baxi Whole House Boiler Size Calculator stated in a post above which included the 2Kw for the Hot Water. I will check this when the system is switched on from cold tomorrow, but I am sure from the temperature tests conducted using D40/41 that the ABV (0.2 to 0.5) is correctly set.

So have now measured the house more accurately, this is the data: Detached, 20 years old, 2 floors, cavity walls, double glazed, 1 chimney, south coast 15m x 15m suspended floor with insulation, 300mm loft insulation Result 25.2Kw (inc hot water allowance)

1st job of the morning. So heating's been on for 90 minutes and measuring flow and return with different settings on the ABV. ABV = 0.2 Temp 60 and 48 ABV = 0.5 Temp 60 and 48 So I think this says that 0.2 looks to be the right setting as there is no leakage. I am unable to feel the...

It's a large house, the previous boiler was a 20 year old 32Kw Potterton, so it seamed the right move to go with 28Kw as recommended by the installer. The pump is one of those fully adjustable smart pumps with a digital display that gives you the Head and Wattage. I am assuming that these...

So I have reduced the pump speed to 5M head / 25 Watts and set D0 to 20Kw, but these settings made only few degree difference in the differential (was 54 Flow - 46 Return) now (54 Flow - 44 Return). I changed the D0 setting whilst the boiler was running and in ramp down mode (i.e only...

The house is a 2 story, 5 bed detached built 20 years ago, suspended floor, cavity wall insulation, around 300mm loft insulation, double glazed, floor area 300sq m.

I just ran the boiler calculator and it came back with 26.4Kw. Also just done a radiator check and it says there is 20Kw of radiators. Will try reducing pump speed, but I did do this today (reduced to 5m) and didn't get much of a change in differential.

Tony D0 is set 30. What does this mean?

Hi It's a 28kw boiler (Vaillant ecoTec plus 428) and I am only achieving a differential of 10 C across the flow and return of the boiler (this is when everything is warmed up). Using a digital probe to measure temperature. I only just now reduced the pump to 5 meter head, but it made...

I should have added. I have 2 diverter valves fitted, heating and hot water, so the Bypass Valve is required for when both of these are closed. No TVR's on the system.

I wondered if someone could help me in understanding central heating pump curves? I am trying to make sure that an automatic bypass valve has been correctly set. The boiler manufacturer requires a minimum flow rate of 1200 lit per hour. Below is the manufactures spec for the pump...